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# Heat Gain from Electrical Motors in Continuous Operation

## Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.

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Electrical motors in air condition systems contributes to the heat loads in air condition systems and will influence on the dimensions of cooling equipment.

Heat loads from electrical motors and fans in different locations can be estimated from the table below:

Electrical Motors - Heat Gain with Continuous Operation
Shaft Output
(kW)
Full Load Electrical Motor Efficiency
- η -
(
%)
Electrical Motor Input
(kW)
Location of Fan and Motor
1
Motor and Fan in the Inlet Air Flow or in the Room
(kW)
2
Motor Outside the Air Flow or Outside the Room. The Fan in the Inlet Air Flow or in the Room
(kW)
3
Motor in the Room. The Fan in the Outlet Air Flow
(kW)
0.05 40 0.13 0.13 0.05 0.08
0.07 46 0.15 0.15 0.07 0.08
0.10 55 0.18 0.18 0.10 0.08
0.14 60 0.23 0.23 0.14 0.09
0.20 64 0.31 0.31 0.20 0.11
0.28 66 0.42 0.42 0.28 0.14
0.40 70 0.60 0.60 0.40 0.20
0.56 72 0.78 0.78 0.56 0.22
0.80 76 1.05 1.05 0.80 0.25
1.1 80 1.38 1.38 1.1 0.28
1.6 80 2.0 2.0 1.6 0.40
2.5 81 3.1 3.1 2.5 0.60
4.0 82 4.9 4.9 4.0 0.90
5.6 84 6.7 6.7 5.6 1.1
8.0 84 9.5 9.5 8.0 1.5
11.2 86 13.0 13.0 11.2 1.8
16 87 18.4 18.4 16 2.4
20 88 22.7 22.7 20 2.7
25 89 28.0 28.0 25 3.0
32 89 36.0 36.0 32 4.0
40 89 45.0 45.0 40 5.0
50 90 56.0 56.0 50 6.0
63 90 70.0 70.0 63 7.0
80 90 89.0 89.0 80 9.0
100 91 110 110 100 10.0
• 1 kW = 1000 Watts = 3412 Btu/h = 737.6 / 550 British hp = 1.341 British hp = 103/9.80665 kgf m/s = 737.6 ft lbf/s = 103/(9.80665 75) metric hp
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## Related Topics

• ### Air Conditioning

Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.

## Related Documents

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• ### Electrical Motors - Heat Loss

Heat loss from an electrical motor to the surroundings.
• ### Electrical Motors - Shaft Power vs. Voltage and Current

Calculate electric motors shaft power.
• ### Heat Loss from Electrical Equipment

Heat loss from electrical equipment like switch-gear, transformers and variable frequency drives.
• ### Three-Phase Electrtical Motors - Power Factor vs. Inductive Load

Inductive loads and power factors with electrical three-phase motors.
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• The Engineering ToolBox (2004). Heat Gain from Electrical Motors in Continuous Operation. [online] Available at: https://www.engineeringtoolbox.com/electrical-motors-heat-gain-d_707.html [Accessed Day Month Year].

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12.8.9

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